using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;

namespace POSV
{
    public abstract class AbstractRequestData
    {
        public readonly SortedList<string , string> NewParameters;

        protected AbstractRequestData()
        {
            this.NewParameters = new SortedList<string , string>();
        }


        public string CreateMd5Sign(string key , string value)
        {
            StringBuilder sb = new StringBuilder();

            //ArrayList akeys = new ArrayList(this.NewParameters.to);
            //akeys.Sort();

            foreach (string k in this.NewParameters.Keys)
            {
                string v = (string)this.NewParameters[k];
                if (null != v && "".CompareTo(v) != 0
                    && "sign".CompareTo(k) != 0
                    //&& "sign_type".CompareTo(k) != 0
                    && "key".CompareTo(k) != 0)
                {
                    sb.Append(k + "=" + v + "&");
                }
            }

            sb.Append(key + "=" + value);
            string sign = GetMD5(sb.ToString() , Encoding.UTF8.BodyName).ToUpper();

            return sign;
        }

        /// <summary>
        /// 获取大写的MD5签名结果
        /// </summary>
        /// <param name="encypStr">需要加密的字符串</param>
        /// <param name="charset">编码</param>
        /// <returns></returns>
        public string GetMD5(string encypStr , string charset)
        {
            string retStr;
            MD5CryptoServiceProvider m5 = new MD5CryptoServiceProvider();

            //创建md5对象
            byte[] inputBye;
            byte[] outputBye;

            //使用GB2312编码方式把字符串转化为字节数组．
            try
            {
                inputBye = Encoding.GetEncoding(charset).GetBytes(encypStr);
            }
            catch
            {
                inputBye = Encoding.GetEncoding("GB2312").GetBytes(encypStr);
            }
            outputBye = m5.ComputeHash(inputBye);

            retStr = BitConverter.ToString(outputBye);
            retStr = retStr.Replace("-" , "").ToUpper();
            return retStr;
        }


        /// <summary>
        /// 输出XML
        /// </summary>
        /// <returns></returns>
        public string ParseXML()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("<xml>");
            foreach (string k in this.NewParameters.Keys)
            {
                string v = (string)this.NewParameters[k];
                if (v != null && Regex.IsMatch(v , @"^[0-9.]$"))
                {

                    sb.Append("<" + k + ">" + v + "</" + k + ">");
                }
                else
                {
                    sb.Append("<" + k + "><![CDATA[" + v + "]]></" + k + ">");
                }

            }
            sb.Append("</xml>");
            return sb.ToString();
        }
    }
}